Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Rate of gastric cancer
RCT	1630 people at high risk of gastric cancer	Gastric cancer 7 years 7/817 (0.86%) with eradication treatment 11/813 (1.35%) with placebo	HR 0.63 95% CI 0.24 to 1.62 P = 0.34		Not significant
RCT	2258 people at high risk of gastric cancer	Gastric cancer 7 years 19/1130 (1.7%) with eradication treatment 27/1128 (2.4%) with placebo	HR 0.70 95% CI 0.39 to 1.27 P = 0.14		Not significant